Hours spent at desktop computers

The manager of a computer software company wishes to study the number of hours senior executives spend at their desktop computers by type of industry. The manager selected a sample of five executives from each of three industries. At the .05 significance level, can she conclude there is a difference in the mean number of hours spent per week by industry?

Banking Retail Insurance
12 8 10
10 8 8
10 6 6
12 8 8
10 10 10

Solution Summary

The hypothesis that there is a difference in the mean number of hours spent per week by industry (Banking, Retail, Insurance) is tested using ANOVA. Explanation and calculations are provided in the attached Excel file.